NORD Drivesystems BU0510 - Manual (Page 35)

3 Description of function
BU 0510 GB-3911 Subject to technical alterations 35
3.8 Output messages
3.8.1 Relays (P434, 441) and digital outputs (P450, P455)
The frequency inverter has two relays and at least two digital outputs, for which of each a function can be
parameterised. The possible messages for the positioning function, which are alsoavailable when the positioning
function is disabled(P600 = "Off"), are summarised in Table .
Message function
(setting)
Description
Reference
(20)
The digital output indicates that there is a valid reference point. The relay or output indicates that
there is a valid reference point. The relay or output is switched off if a reference point run is started.
The relay or output switches on as soon as the reference point has been found. The status after
switching on the inverter supply voltage depends on the setting in P604 "Encoder Type". With the
setting for absolute encoders (1, 5, 6-15) and for incremental encoders with position memory
(3 and 5) the relay or output is switched on after the inverter is switched on. With other settings it is
switched off.
Position reached
(21)
With this function the inverter reports that the setpoint position has been reached. The relay or
output switches on if the difference between the setpoint and the actual position is smaller than the
value set in parameter P625 "Output Hysteresis" and the current frequency is lower than the
frequency parameterised in parameter P104 "Minimum Frequency" + 2Hz.
For synchronous operation the frequency parameterised in (P104) does not apply. In this case the
frequency setpoint is the condition.
Comparative position
(22) The relay or output switches on if the actual position is greater than or equal to parameter P626
"Comparative Position Output". The relay or output switches off again if the actual position is
smaller than the "Comparative Position Output" - "Output Hysteresis". The sign of the value is
taken into account.
[Relay or output switches on if p
ist
≥ p
vergl
and switches off if p
ist
< p
vergl
– p
hyst
]
Comparative position
value
(23) The function "Comparative Position Value" corresponds to the function "Comparative Position" with
the difference that the position is processed as an absolute value (without sign). The relay or
output is switched on if the actual position exceeds the value parameterised in P626 "Comparative
Position Output" or undershoots the same negative value.
[Relay or output switches on if |p
ist
≥ |p
vergl
and switches off if p
ist
| < |p
vergl
| – p
hyst
]
Position array value
(24)
The relay or output always switches on if a position parameterised in parameter P613 "Position" is
reached or passed over. This function is also available if the position setpoint mode in parameter
P610 "Setpoint Mode" is not set to "Position Array" i.e. the function is available for all functions
which can be set.
Comparative position
reached
(25)
Comparative position reached The relay or output switches on if the difference between the actual
position and the value parameterised in P626 "Comparative Position Output" is less than the value
set in parameter P625 "Output Hysteresis".
[Relay/output switches on if |(p
vergl
- p
ist
)| < p
hyst
]
Comparative position
value reached
(26)
Comparative position value reached. The relay or output switches on if the difference between the
actual position value and the value parameterised in P626 "Comparative Position Output" is less
than the value set in parameter P625 "Output Hysteresis".
[Relay/output switches on if |(|p
vergl
| - |p
ist
|)| < p
hyst
]
Table 17: Digital output messages for positioning function
3.8.2 Output messages via BUS I/O Out Bits (P481)
All relay/output messages can also be read out via the serial interface by means of the Bus I/O Out Bits. For
this, one of the actual bus values (P543, P544 and P545) "Function Bus - Actual Value") must be
parameterised to the setting "Bus Out Bits 0...7" and the functions assigned to the corresponding bits under
P481 "Function Bus I/O In Bits".